Robot probe detects high radiation at No.3 reactor
Jul. 13, 2012
[Tepco] has detected high levels of radiation in the basement of the No. 3 reactor, with a maximum dose of 360 millisieverts per hour.
[Tepco] sent in a robot on Wednesday to the room where the suppression chamber is located. It was the first robot to probe this area of the plant.
They show that a door on the southwestern side is broken. There is no other apparent damage or sign of water leakage.
But high levels of radiation were detected. Readings exceeded 100 millisieverts per hour in a number of locations. Average levels were higher than those in the No.2 reactor.
Engineers lost control of the remote-controlled robot after around 3 hours of operation. They say there are problems with the connecting cable and they’ve been unable to regain control.
TEPCO officials say they have no option but to leave the robot where it is for the time being.
This may pose a problem to the utility’s efforts to decommission the reactor. The operators are in a hurry to identify and repair damage to the reactor’s suppression chamber and containment vessel. They want to pump in water in order to remove the melted fuel lying at the bottom.
h/t Anonymous tip
Published: July 13th, 2012 at 2:36 pm ET
- NHK: Suppression chamber “may have been destroyed” at Reactor No. 2 (VIDEO) March 28, 2012
- Document shows nuclear fuel burned through bottom of containment vessel under Fukushima reactor — Official: Leakage we observed indicates melt-through by ‘shell attack’ — “This is a very big problem… fuel debris in the PCV is doing something bad” (VIDEO) July 13, 2015
- Water level now below BOTTOM of fuel rods in No. 1 — Suggests nuclear fuel is in a molten mass at bottom of reactor (VIDEO) May 12, 2011
- NHK: Tepco can’t find holes at Reactor No. 2 — Nuclear Expert: It’s leaking like a sieve — “No one knows how they’re ever going to remove fuel in my lifetime” — Likely 50, 60, 70 years — Radiation like outer space (VIDEO) April 18, 2012
- Japan Official: Fuel from Fukushima reactors is “melting down daily” — AP: No way of confirming melted fuel is at bottom of containment vessels — Tepco Adviser: “Schedule for decommissioning the plant is pure supposition” — The Economist: This is ‘Mission Impossible’ (VIDEO) February 8, 2015